They made these blunders because they were in very unfamiliar, double-edged positions. Yes, sometimes nerves got involved but sometimes the positions were just

They made these blunders because they were in very unfamiliar, double-edged positions. Yes, sometimes nerves got involved but sometimes the positions were just very sharp and complex and they couldn’t find the engine line. Also, a lot of those engine lines would’ve just made a draw, something a human player would never do when they’re playing with the white pieces in a need-to-win game.